Random load with delay problems

Hi and sorry if this question has been asked before! I’ve searched online and on this forum and can’t seem to find an answer so hopefully someone can help here.

I’m trying to randomly load some movieclips - MC1, MC2, MC3, MC4, MC5 - from my library but have about a 15 second delay between them. At the moment I have a script that loads external swfs randonly into an empty movieclip but the project I’m working on needs them all to be within one swf file. Any help would be great!